49 lines
1.0 KiB
Python
49 lines
1.0 KiB
Python
"""
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属性的使用
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- 使用已有方法定义访问器/修改器/删除器
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Version: 0.1
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Author: 骆昊
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Date: 2018-03-12
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"""
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class Car(object):
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def __init__(self, brand, max_speed):
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self.set_brand(brand)
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self.set_max_speed(max_speed)
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def get_brand(self):
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return self._brand
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def set_brand(self, brand):
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self._brand = brand
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def get_max_speed(self):
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return self._max_speed
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def set_max_speed(self, max_speed):
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if max_speed < 0:
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raise ValueError('Invalid max speed for car')
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self._max_speed = max_speed
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def __str__(self):
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return 'Car: [品牌=%s, 最高时速=%d]' % (self._brand, self._max_speed)
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# 用已有的修改器和访问器定义属性
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brand = property(get_brand, set_brand)
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max_speed = property(get_max_speed, set_max_speed)
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car = Car('QQ', 120)
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print(car)
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# ValueError
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# car.max_speed = -100
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car.max_speed = 320
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car.brand = "Benz"
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print(car)
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print(Car.brand)
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print(Car.brand.fget)
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print(Car.brand.fset)
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